Before posting anything, please review the Physics Forums Global Guidelines.
Again, for some odd reason, people...

Apr2211 05:26 AM
ZapperZ

1 
41,678 
currently i'm studying the topic entropy. According to my text, entropy will increase when the accessible energy...

Aug411 03:30 PM
mathfeel

5 
4,247 
why is angular displacement considered an axial vector only for small values?

Aug411 03:19 PM
Studiot

2 
930 
If a light travels from A to B and there's a plane of glass in between the two points, will the total time it takes to...

Aug411 01:08 PM
y33t

3 
1,039 
I can't remember how to derive this equation...
x(fluxion)
a=acceleration
x=a
From that, how do we get>
...

Aug411 12:07 PM
tinytim

5 
872 
Hi all,
i'm doing a research essay on how the viscosity of a fluid affects it's splashes.
i'm currently stuck and...

Aug411 12:01 PM
256bits

1 
1,229 
Hello, I was wondering if the cosine of theta, in the work equation, related to the angle of the applied force?

Aug411 10:51 AM
boyongo

14 
1,284 
Suppose I have a mechanical system with l + m degrees of freedom and an associated lagrangian
...

Aug411 09:27 AM
Petr Mugver

4 
1,003 
So I do a wee bit of climbing, and an important thing to take into account when building anchors is the angles formed...

Aug411 07:47 AM
Spinnor

4 
1,143 
Hi all,
I am having trouble understanding Virtual displacements and related ideas and would appreciate your help!
...

Aug411 06:38 AM
Studiot

4 
4,115 
When an EM wave goes in a conductor it says that the B field component lags the E field component, What causes this? I...

Aug411 06:29 AM
y33t

6 
914 
Hi everyone,
Light has a dual nature ; wave and particle. Particle part can be explained using Quantum approaches...

Aug411 06:22 AM
y33t

13 
2,394 
If you throw a tennis ball straight up in a moving train, the ball will drop back down on the same spot so you can...

Aug411 06:00 AM
jeannagui

4 
2,296 
Hi there,
Assume that I push a box with a force of say 50 Newtons and the box moves forward. At the same time, the...

Aug411 02:54 AM
kevinfrankly

5 
1,108 
Curious your thoughts about the use of a Stirling engine to power a space station, auxiliary power for space ships...

Aug411 12:21 AM
Alfred2011

8 
2,013 
Why do I see newtons 3 laws (mostly 2 and 3) given using differentials (F=dp/dt etc...) when it is far simpler to use...

Aug311 09:14 PM
Vorde

2 
1,127 
As you can see in the attached doc, we have two winches on the same shaft of motor M1, two moving pulleys ( 3 and 4 )...

Aug311 05:41 PM
Marinel

2 
1,398 
I have a few questions regarding vertical oscillations (not damped). Let's say you have a spring hanging from a...

Aug311 05:39 PM
ustudent

9 
898 
what are the limitation work energy theorem ?
this theorem is very helpful in solving questions. But I think there...

Aug311 02:31 PM
Steger

9 
2,805 
I was always told that EM radiation is a far field effect. Does this mean that the light emitted from the accelerating...

Aug311 01:54 PM
chrisbaird

7 
1,224 
My colleague and I have a disagreement about the storage of electrical energy using capacitors in DC circuitry. It...

Aug311 01:19 PM
Jack23454

24 
3,199 
My curiosity has been aroused by climate change debates, but my physics is inadequate. Perhaps I can get some help. ...

Aug311 12:39 PM
schip666!

5 
1,209 
If a meteor entered the earth's atmosphere at 11 or so km/sec and impacted the earth with a direct hit (by impact time...

Aug311 12:12 PM
Ryan_m_b

23 
5,597 
Consider a Poisson bracket of Q and R. Are there any constraints on Q and R?

Aug311 05:33 AM
failexam

0 
474 
I am reading some papers that mention evanescent waves. From what I can find, evanescent waves occur because of the...

Aug211 04:44 PM
vanhees71

3 
1,808 
I am trying to understand all the possibilities that a linear birefringent material can provide. The resources I am...

Aug211 04:07 PM
ksmith1281

4 
1,460 
If you increase mass with speed does the forces that hold molecules’ together increase in per portion ? If not do the...

Aug211 04:02 PM
Drakkith

2 
702 
I noticed that in water, sound travels faster than in air, but when light hits water, its velocity decreases.
Is...

Aug211 06:56 AM
harrylin

10 
1,775 
As electrons leave one half of a galvanic cell and flow to the other, a difference in charge is established. If no...

Aug111 05:39 PM
Modulated

1 
1,217 
Hello,
I have problem with understanding the concept of energy of deformed body. As far as I know, Clapeyron's...

Aug111 04:03 PM
Studiot

18 
2,574 
Hey guys,
What exactly does a nonholonomic constraint tell about a system. For instance I am working on a...

Aug111 03:49 PM
gbeech

6 
7,764 
For N(E)=Aexp(E/kT), I know that N(E) is the no. of particles with a certain energy E,
but why does integrating ...

Aug111 11:03 AM
chrisbaird

2 
1,058 
suppose i have a bucket full of water in a closed room,the water is kept undisturbed for say 5 days,after those 5 days...

Aug111 10:56 AM
DaleSpam

52 
5,402 
Hello,
This is simple question, but I didnt find the clear answer e.g. on the web pages:
How Faraday cage works...

Aug111 09:58 AM
chrisbaird

7 
1,454 
Dear fellows since a long I have been puzzled by the cricket ball swing and reverse swing phenomenon. For fast bowlers...

Aug111 08:57 AM
jonny888

8 
10,812 
How can random electron currents in the earth's core create a ordered magnetic field?
What makes a current in the...

Aug111 08:09 AM
lufc88

8 
1,827 
In lecture 2 of his series on Classical Physics, Prof. Balakrishnan asks how many degrees of freedom there are in a...

Aug111 07:09 AM
jambaugh

22 
2,943 
I'm reading through some material on vibrating strings. In one book, the author repeatedly uses energy analysis to...

Aug111 03:13 AM
Philip Wood

7 
1,642 
Hello all,
I have written a python code implementing the RungeKutta fourth order method for higher orders to...

Aug111 03:06 AM
vanhees71

1 
2,096 
is it meaningful to define a distance between two points in a phase space?
it is interesting that we can define...

Aug111 03:04 AM
vanhees71

2 
1,259 
I hope this topic belongs here, after all this is about color and color is described through quantum mechanics.
...

Jul3111 09:30 PM
NanoPassion

5 
1,449 